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========================
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Qubes R3.0 release notes
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========================
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Qubes R3.0 Release Notes
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------------------------
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This Qubes OS release is dedicated to the memory of Caspar Bowden.
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New features since 2.0
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^^^^^^^^^^^^^^^^^^^^^^
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- HAL (Hypervisor Abstraction Layer) - based on libvirt, opens a whole new possibilities of using different hypervisors. Currently Qubes OS uses Xen.
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- Xen 4.4 - many new features, but for us the most important is much more mature libxl toolstack.
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- Qrexec 3 - greatly improved performance by using direct VM-VM connections and bigger buffers.
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- Debian templates gets official support.
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- Whonix templates
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- Build system improvements - especially support for distribution-specific plugins (makes supporting multiple distributions much easier) and building templates using DispVM.
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- Automated tests - makes much easier to find bugs, before its even shipped to users
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Known issues
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^^^^^^^^^^^^
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- Windows Tools: ``qvm-block`` does not work
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- UEFI is not supported, you need to enable “legacy boot” in BIOS before installing Qubes OS
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- Some icons in the Qubes Manager application might not be drawn correctly when using the Xfce4 environment in Dom0. If this bothers you, please use the KDE environment instead.
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- If your GPU is not correctly supported by the Dom0 kernel (e.g. the 3D desktop effects do not run smoothly) then you might experience “heaviness” with Windows 7-based AppVMs. In that case, please solve the problem with your GPU support in Dom0 in the first place (by using a different kernel), or install Qubes OS on a different system.
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- For other known issues take a look at `our tickets <https://github.com/QubesOS/qubes-issues/issues?q=is%3Aopen+is%3Aissue+milestone%3A%22Release+3.0%22+label%3Abug>`__
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It is advised to install updates just after system installation to apply bug fixes for (some of) the above problems.
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Downloads
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^^^^^^^^^
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See `Qubes Downloads <https://www.qubes-os.org/downloads/>`__.
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Installation instructions
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^^^^^^^^^^^^^^^^^^^^^^^^^
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See :doc:`Installation Guide </user/downloading-installing-upgrading/installation-guide>`.
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Upgrading
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^^^^^^^^^
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From R3.0 release candidate
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---------------------------
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If you are using Qubes R3.0rc1, R3.0rc2 or R3.0rc3, just install system updates, there is no special steps required.
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From R2.0 or earlier
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--------------------
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The easiest and safest way to upgrade to Qubes R3.0 is to install it from scratch and use :doc:`qubes backup and restore tools </user/how-to-guides/how-to-back-up-restore-and-migrate>` for migrating of all of the user VMs.
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Users of Qubes R2 can upgrade using :doc:`experimental procedure </user/downloading-installing-upgrading/upgrade/3_0>`.
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